Have the following set-up. A zepp cut for 20 mtrs, open wire feed line commercial 450 black ladder line to a MFJ-Versa tunerIII, mfj 961, connected to the balanced line input.
44' !! 44'
!!about 40' high drop straight down.(450ohm)
20' fed direct to tuner in shack.(450ohm)
rod/grnd -----tuner----radio---mike, MC-80
Loads fine on all bands with the tuner, vry low swr on all <1.2:1 when tuned...
Problem: I use a Kenwood ts430 with a MC-80. It appears that at hf fequencies greater than 14mhz...I.e. the 21mhz,28mhz area I am experiencing problems with the MC-80 microphone (appears to be a amplified mike, I have no data sheet) It appears that RF is getting into the mike, since the MFJ versa tuner and 430 are only about 2'-4' away. MC-80 works fine on the lower frequencies from 14mhz down to 3.5mhz. I switched mikes, to the 430 mobile version,
MC42s and have no problems at any band (this is a none amplified mike--push to talk) So it appears to be RF or an ocillation in the MC-80, my guess is RF...Is there a better solution to the above feed system that I could use and still use the 20mtr zepp for all band use? (to cut down on the RF in the Shack) Also, I have the station firmly grounded, 8' ground rod, with 1/2" braided copper wire firmly attached to 430 and tuner. Any ideas on RFI fixes for mike mc-80 or Feed system....
Tnx for any feedback in advance..